聚合物共混物脆韧转变性能研究 Ⅲ.分散相形态参数之间的关系

STUDY OF THE BRITTLE DUCTILE TRANSITION OF POLYMER BLENDS Ⅲ.A NEW EQUATION FOR CORRELATING MORPHOLOGICAL PARAMETERS OF THE BLENDS WITH THE PSEUDONETWORK MORPHOLOGY

为了研究形态（特别是分散状态）对聚合物共混物韧性的影响，建立了准网络形态模型，定义了分散相分布系数（ξ，０＜ξ１），并给出其物理意义，推导了基体层厚度的计算公式，研究了形态参数的变化对基体层厚度的影响．对于常见的无规形态，ξ≈１．对于准网络形态，ξ＜１，并且不是常数．计算结果表明，减小ξ和分散相粒径及其分布、增大其体积分数有利于减小基体层厚度．从理论上证明了准网络形态比无规形态更有利于减小基体层厚度．

A model for the pseudonetwork morphology is established to further study the influence of morphology on the toughness of polymer blends.The particle dispersion factor ( ξ ) is defined,where 0< ξ 1.For the particle dispersions of cubic lattice,well dispersed particles and pseudonetwork,the values of ξ are equal to,close to and smaller than one,respectively.A new equation for calculating the matrix ligament thickness of polymer blends with the pseudonetwork morphology is derived.The effects of other morphological parameters on the matrix ligament thickness are analyzed.The calculated variations indicate that the matrix ligament thickness reduces with the reductions of particle size,size distribution and particle dispersion factor and with the increase of particle volume fraction,respectively.It is demonstrated that the matrix ligament thickness of polymer blends with the pseudonetwork morphology is smaller than that with the morphology of well dispersed particles when other morphological parameters of particle are identical.